<?php

/* --------------------------------------------------------------------

  Chevereto
  http://chevereto.com/

  @author	Rodolfo Berrios A. <http://rodolfoberrios.com/>
			<inbox@rodolfoberrios.com>

  Copyright (C) Rodolfo Berrios A. All rights reserved.

  BY USING THIS SOFTWARE YOU DECLARE TO ACCEPT THE CHEVERETO EULA
  http://chevereto.com/license

  --------------------------------------------------------------------- */

namespace CHV;
use G, Exception;

class Listing {

	protected static $valid_types = ['images', 'albums', 'users'];
	protected static $valid_sort_types = ['date', 'size', 'views', 'id', 'image_count', 'name'];

	// Set the type of list
	public function setListing($listing) {
		$this->listing = $listing;
	}

	// Sets the type of resource being listed
	public function setType($type) {
		$this->type = $type;
	}

	// Sets the offset (sql> LIMIT offset,limit)
	public function setOffset($offset) {
		$this->offset = intval($offset);
	}

	public function setParamsHidden($params) {
		$this->params_hidden = $params;
	}

	// Sets the limit (sql> LIMIT offset,limit)
	public function setLimit($limit) {
		$this->limit = intval($limit);
	}

	public function setItemsPerPage($count) {
		$this->items_per_page = intval($count);
	}

	// Sets the sort type (sql> SORT BY sort_type)
	public function setSortType($sort_type) {
		$this->sort_type = $sort_type == 'date' ? 'id' : $sort_type;
	}

	// Sets the sort order (sql> DESC | ASC)
	public function setSortOrder($sort_order) {
		$this->sort_order = $sort_order;
	}

	// Sets the WHERE clause
	public function setWhere($where) {
		$this->where = !empty($where) ? $where : NULL;
	}

	// Sets the owner id of the content, usefull to add privacy
	public function setOwner($user_id) {
		$this->owner = $user_id;
	}

	// Sets the user id of the request, usefull to add privacy
	public function setRequester($user) {
		$this->requester = $user;
	}

	// Sets the category
	public function setCategory($category) {
		$this->category = (int)$category;
	}

	// Sets the privacy layer of this listing
	public function setPrivacy($privacy) {
		$this->privacy = $privacy;
	}

	// Sets the tools available for this listing (only if applies)
	public function setTools($tools=[]) {
		$this->tools = $tools;
	}

	public function bind($param, $value, $type = null) {
		$this->binds[] = array(
			'param' => $param,
			'value' => $value,
			'type'  => $type
		);
	}

	public function getTotals($bool) {
		$this->get_totals = (bool) $bool;
	}

	/**
	 * Do the thing
	 * @Exeption 4xx
	 */
	public function exec($get_total_count=false) {

		$this->validateInput();

		$tables = DB::getTables();

		if(empty($this->requester)) {
			$this->requester = Login::getUser();
		} else if(!is_array($this->requester)) {
			$this->requester = User::getSingle($this->requester, 'id');
		}

		$joins = [
			// Get image + storage + parent album + user uploader
			'images' => [
				'storages'	=> 'LEFT JOIN '.$tables['storages'].' ON '.$tables['images'].'.image_storage_id = '.$tables['storages'].'.storage_id',
				'users'		=> 'LEFT JOIN '.$tables['users'].' ON '.$tables['images'].'.image_user_id = '.$tables['users'].'.user_id',
				'albums'	=> 'LEFT JOIN '.$tables['albums'].' ON '.$tables['images'].'.image_album_id = '.$tables['albums'].'.album_id',
				'categories'=> 'LEFT JOIN '.$tables['categories'].' ON '.$tables['images'].'.image_category_id = '.$tables['categories'].'.category_id',
			],
			'users' => [],
			'albums' => [
				'users'		=> 'LEFT JOIN '.$tables['users'].' ON '.$tables['albums'].'.album_user_id = '.$tables['users'].'.user_id'
			]
		];

		if($this->type == 'users' && $this->sort_type == 'views') {
			$this->sort_type = 'content_views';
		}

		// Params hidden handler. Introduced to avoid stupid route.json.php cloning
		// Same level content clauses (it won't help to filter joined tables)
		if(!is_null($this->params_hidden)) {
			// hide_empty
			$emptyTypeClauses = [
				'albums'	=> 'album_image_count > 0',
				'users'		=> 'user_image_count > 0 OR user_avatar_filename IS NOT NULL OR user_background_filename IS NOT NULL'
			];
			if(array_key_exists($this->type, $emptyTypeClauses) && $this->params_hidden['hide_empty'] == 1) {
				$whereClauses[] = $emptyTypeClauses[$this->type];
			}
			// hide_banned
			if($this->params_hidden['hide_banned'] == 1) {
				$whereClauses[] = '(' . $tables['users'] . '.user_status IS NULL OR ' . $tables['users'] . '.user_status <> "banned"' . ')';
			}
			// animated
			if($this->type == 'images' && $this->params_hidden['is_animated'] == 1) {
				$whereClauses[] = 'image_is_animated = 1';
			}
			// We are getting clauser!.. got it? nvm...
			if(!empty($whereClauses)) {
				$whereClauses = join(' AND ', $whereClauses);
				$this->where = (empty($this->where) ? 'WHERE ' : ($this->where . ' AND ')) . $whereClauses;
			}
		}

		$type_singular = DB::getFieldPrefix($this->type);

		// Attempt to add explicit clauses
		if(!empty($this->where)) {
			$where_clauses = explode(' ', str_ireplace('WHERE ', NULL, $this->where));
			$where_arr = [];
			foreach($where_clauses as $clause) {
				if(!preg_match('/\./', $clause)) {
					$field_prefix = explode('_', $clause, 2)[0]; // field prefix (singular)
					$table = DB::getTableFromFieldPrefix($field_prefix); // image -> chv_images
					$table_prefix = G\get_app_setting('db_table_prefix');
					$table_key = !empty($table_prefix) ? G\str_replace_first($table_prefix, NULL, $table) : $table;
					if(array_key_exists($table_key, $tables)) {
						$where_arr[] = $table . '.' . $clause;
					} else {
						$where_arr[] = $clause;
					}
				} else {
					$where_arr[] = $clause; // Let it be
				}
			}
			$this->where = 'WHERE ' . implode(' ', $where_arr);
		}

		// Add category clause
		if($this->type == 'images' && $this->category) {
			$category_qry = $tables['images'] . '.image_category_id = ' . $this->category;
			if(empty($this->where)) {
				$this->where = 'WHERE ' . $category_qry;
			} else {
				$this->where .= ' AND ' . $category_qry;
			}
		}

		// Privacy layer
		if(!$this->requester['is_admin'] && in_array($this->type, ['images', 'albums', 'users']) && ((!$this->owner || !$this->requester) || $this->owner !== $this->requester['id'])) {

			if(empty($this->where)) {
				$this->where = 'WHERE ';
			} else {
				$this->where .= ' AND ';
			}

			$nsfw_off = $this->requester ? !$this->requester['show_nsfw_listings'] : !getSetting('show_nsfw_in_listings');

			switch($this->type) {
				case 'images':
					if($nsfw_off) {
						$nsfw_off_clause = $tables['images'].'.image_nsfw = 0';
						if($this->requester) {
							$this->where .= '(' . $nsfw_off_clause .  ' OR (' .  $tables['images'] . '.image_nsfw = 1 AND ' .  $tables['images'] . '.image_user_id = ' . $this->requester['id'] . ')) AND ';
						} else {
							$this->where .= $nsfw_off_clause . ' AND ';
						}
					}
				break;
				case 'users':
					$this->where .= $tables['users'].'.user_is_private = 0';
				break;
			}

			if($this->type !== 'users') {
				if(getSetting('website_privacy_mode') == 'public' || $this->privacy == 'private_but_link' || getSetting('website_content_privacy_mode') == 'default') {
					$this->where .= '(' . $tables['albums'].'.album_privacy NOT IN';
					$privacy_modes = ['private', 'private_but_link', 'password', 'custom'];
					if(in_array($this->privacy, $privacy_modes)) {
						unset($privacy_modes[array_search($this->privacy, $privacy_modes)]);
					}
					$this->where .= " (" . "'" . implode("','", $privacy_modes) . "'" . ") ";
					$this->where .=  "OR ".$tables['albums'].'.album_privacy IS NULL OR '.$tables['albums'].'.album_user_id';
					$this->where .= (!$this->requester ? ' IS NULL' : '='.$this->requester['id']) . ')';
				} else {
					$injected_requester = !$this->requester['id'] ? 0 : $this->requester['id'];
					$this->where .= '(' . $tables['albums'].'.album_user_id = '.$injected_requester;
					$this->where .= $this->type == 'albums' ? ')' : (' OR ' . $tables['images'].'.image_user_id = '.$injected_requester . ')');
				}
			}

		}

		if(!empty($this->where)) {
			$this->where = "\n" . $this->where;
		}

		$order_by = "\n" . 'ORDER BY ' . DB::getTableFromFieldPrefix($type_singular) . '.' . $type_singular . '_' . $this->sort_type . ' ' . strtoupper($this->sort_order);

		$limit = "\n" . 'LIMIT ' . $this->offset . ',' . ($this->limit + 1);

		$base_table = $tables[$this->type];

		// Normal query
		if(empty($joins[$this->type])) {
			$query = 'SELECT * FROM ' . $base_table;
			$query .= $this->where . $order_by . $limit;
		// Alternative query
		} else {
			if(!empty($this->where)) {
				preg_match_all('/' . G\get_app_setting('db_table_prefix') . '([\w_]+)\./', $this->where, $where_tables);
				$where_tables = array_values(array_diff(array_unique($where_tables[1]), [$this->type]));
			} else {
				$where_tables = FALSE;
			}
			if($where_tables) {
				$join_tables = $where_tables;
			} else {
				reset($joins);
				$join_tables = [key($joins)];
			}

			$join = NULL;
			foreach($join_tables as $join_table) {
				if(!empty($joins[$this->type][$join_table])) {
					$join .= "\n" . $joins[$this->type][$join_table];
					unset($joins[$this->type][$join_table]);
				}
			}

			// Get rid of the original Exif data (for listings)
			$null_db = $this->type == 'images' ? ', NULL as image_original_exifdata ' : NULL;

			$query = 'SELECT * ' . $null_db . 'FROM (SELECT * FROM ' . $base_table . $join . $this->where . $order_by . $limit . ') ' . $base_table;
			if(!empty($joins[$this->type])) {
				$query .=  "\n" . implode("\n", $joins[$this->type]);
			}
			$query .= $order_by;
		}

		try {
			$db = DB::getInstance();
			$db->query($query);
			if(is_array($this->binds)) {
				foreach($this->binds as $bind) {
					$db->bind($bind['param'], $bind['value'], $bind['type']);
				}
			}

			$this->output = $db->fetchAll();
			$this->output_count = $db->rowCount();
			$this->has_page_next = $db->rowCount() > $this->limit;
			if($db->rowCount() > $this->limit) {
				array_pop($this->output);
			}
			$this->output = G\safe_html($this->output);
			$this->nsfw = FALSE;

			$this->output_assoc = [];
			$formatfn = 'CHV\\' . ucfirst(substr($this->type, 0, -1));
			foreach($this->output as $k => $v) {
				$val = $formatfn::formatArray($v);
				$this->output_assoc[] = $val;
				if(!$this->nsfw and $val['nsfw']) {
					$this->nsfw = TRUE;
				}
			}

			$this->sfw = !$this->nsfw;

			$this->has_page_prev = $this->offset > 0;

		} catch(Exception $e) {
			throw new ListingException($e->getMessage(), 400);
		}

		// Get album slices and stuff
		if($this->type == 'albums' and $this->output) {

			$album_slice_qry_tpl = 'SELECT * FROM ' . $tables['images'] . ' LEFT JOIN ' . $tables['storages'] . ' ON ' . $tables['images'] . '.image_storage_id = ' . $tables['storages'] . '.storage_id WHERE ' . $tables['images'] . '.image_album_id=%ALBUM_ID% ORDER BY ' . $tables['images'] . '.image_id ASC LIMIT 0,5';
			$albums_slice_qry_arr = [];
			$albums_mapping = [];
			foreach($this->output as $k => &$album) {
				// Album count
				if($album['album_image_count'] < 0) {
					$album['album_image_count'] = 0;
				}
				$album['album_image_count_label'] = _n('image', 'images', $album['album_image_count']);
				// Album slice
				$albums_slice_qry_arr[] = str_replace('%ALBUM_ID%', $album['album_id'], $album_slice_qry_tpl);
				// Album mapping
				$albums_mapping[$album['album_id']] = $k;
			}

			$albums_slice_qry = '(' . implode(') ' . "\n" . 'UNION ALL ' . "\n" . '(', $albums_slice_qry_arr) . ')';

			try {
				$db->query($albums_slice_qry);
				$albums_slice = $db->fetchAll();
				if($albums_slice) {
					foreach($albums_slice as $slice) {
						$album_key = $albums_mapping[$slice['image_album_id']];
						if(!array_key_exists('album_images_slice', $this->output[$album_key])) {
							$this->output[$album_key]['album_images_slice'] = [];
						}
						$this->output[$album_key]['album_images_slice'][] = $slice;
					}
				}
			} catch(Exception $e) {
				throw new ListingException($e->getMessage(), 400);
			}

		}

	}

	public static function getTabs($args=[], $expanded=FALSE) {
		$default = [
			'list'		=> TRUE,
			'REQUEST'	=> $_REQUEST,
			'listing'	=> 'explore',
			'basename'	=> G\get_route_name(),
			'tools'		=> TRUE,
			'tools_available' => [],
		];
        $args = array_merge($default, $args);
		// Fix lazy basenames
		if(strpos($args['basename'], G\get_base_url()) !== FALSE) {
			$args['basename'] = G\str_replace_first(G\get_base_url() .'/', NULL, $args['basename']);
		}
		// Semantics -> trending | popular | recent
		$semantics = [
			'recent'	=> [
				'label'		=> _s('Recent'),
				'content' 	=> 'all',
				'sort'		=> 'date_desc',
			],
			'trending'	=> [
				'label'		=> _s('Trending'),
				'content' 	=> 'all',
				'sort'		=> 'views_desc',
			],
		];

		// Criteria -> images | albums | users
		// Criteria -> [CONTENT TABS]
		$criterias = [
			'top-users'		=> [
				'label'		=> _s('Top users'),
				'sort'		=> 'image_count_desc',
				'content'	=> 'users',
			],
			'most-recent'	=> [
				'label'		=> _s('Most recent'),
				'sort'		=> 'date_desc',
				'content'	=> 'all',
			],
			'most-oldest'	=> [
				'label' 	=> _s('Oldest'),
				'sort'		=> 'date_asc',
				'content'	=> 'all',
			],
			'most-viewed'	=> [
				'label'		=> _s('Most viewed'),
				'sort'		=> 'views_desc',
				'content'	=> 'all',
			],
		];
		$listings = [
			'explore'	=> [
				'label'		=> _s('Explore'),
				'content'	=> 'images',
			],
			'animated'	=> [
				'label'		=> _s('Animated'),
				'content'	=> 'images',
				'where'		=> 'image_is_animated = 1',
				'semantic'	=> TRUE,
			],
			'search'	=> [
				'label'		=> _s('Search'),
				'content'	=> 'all',
			],
			'users'	=> [
				'label'		=> _s('People'),
				'content'	=> 'users',
			],
			'images'	=> [
				'label'		=> _n('Image', 'Images', 2),
				'content'	=> 'images',
			],
			'albums'	=> [
				'label'		=> _n('Album', 'Albums', 2),
				'content'	=> 'albums',
			],
		];
		$listings = array_merge($listings, $semantics);

		$parameters = $listings[$args['listing']];

		if(is_array($args['exclude_criterias'])) {
			foreach($args['exclude_criterias'] as $exclude) {
				if(array_key_exists($exclude, $criterias)) {
					unset($criterias[$exclude]);
				}
			}
		}

		// Content -> most recent | oldest | most viewed | most liked
		// Content -> [CRITERIA TABS]
		$contents = [
			'images' => [
				'label' => _n('Image', 'Images', 2),
			],
			'albums' => [
				'label' => _n('Album', 'Albums', 2),
			],
			'users' => [
				'label' => _n('User', 'Users', 2),
			]
		];
		$i = 0;
		$currentKey = NULL;

		foreach(($parameters['content'] == 'all' ? $contents : ($parameters['semantic'] ? $semantics : $criterias)) as $k => $v) {

			if($parameters['content'] == 'all') {
				$content = $k;
				$id = 'list-' . $args['listing'] . '-' . $content; // list-popular-images
				$sort = $parameters['sort'];
			} else {
				$content = $parameters['content'];
				if($v['content'] !== 'all' && $v['content'] !== $content) {
					continue;
				}
				$id = 'list-' . $k; // list-most-oldest
				$sort = $v['sort'];
			}
			if(!$content) {
				$content = 'images'; // explore
			}
			$basename = $args['basename'];
			$default_params = [
				'list' => $content,
				'sort' => $sort,
				'page' => '1',
			];
			$params = $args['params'] ?: $default_params;
			foreach((array)$args['params_remove_keys'] as $key) {
				unset($params[$key]);
			}
			if(is_array($args['params']) && array_key_exists('q', $args['params']) && $args['listing'] == 'search') {
				$args['params_hidden']['list'] = $content;
				$basename .= '/' . $content;
			}
			foreach((array)$args['params_hidden'] as $kk => $vv) {
				if(array_key_exists($kk, $params)) {
					unset($params[$kk]);
				}
			}
			$query_append = ($basename ? '/' : NULL) . '?' . http_build_query($params);

			$current = isset($args['REQUEST']['sort']) ? $args['REQUEST']['sort'] == $v['sort'] : FALSE;
			if($i==0 && !$current) {
				$current = !$args['REQUEST']['sort'];
			}
			if($current && is_null($currentKey)) {
				$currentKey = $i;
			}

			$tab = [
                'list'				=> (bool) $args['list'],
				'tools'				=> $content == 'users' ? FALSE : (bool) $args['tools'],
				'tools_available'	=> $args['tools_available'],
				'label'				=> $v['label'],
				'id'				=> $id,
				'params'			=> G\str_replace_first('/?', NULL, $query_append),
				'current'			=> (bool) $current,
				'type'				=> $content,
				'url'				=> G\get_base_url($basename . $query_append)
			];

			if($args['tools_available'] && !G\Handler::getCond('allowed_to_delete_content') && array_key_exists('delete', $args['tools_available'])) {
				unset($args['tools_available']['delete']);
			}
			if($args['tools_available'] == NULL) {
				unset($tab['tools_available']);
			}

			if($args['params_hidden']) {
				$tab['params_hidden'] = http_build_query($args['params_hidden']);
			}

			$tabs[] = $tab;
			unset($id, $params, $basename, $query_append, $content, $current);
			$i++;
		}

		if(is_null($currentKey)) {
			if($parameters['content'] == 'all') {
				foreach($tabs as $k => &$v) {
					if(isset($args['REQUEST']['list']) && $v['type'] == $args['REQUEST']['list']) {
						$v['current'] = TRUE;
						$currentKey = $k;
						break;
					}
				}
			} else {
				$currentKey = 0;
				$tabs[0]['current'] = TRUE;
			}
		}

		if($expanded) {
			return ['tabs' => $tabs, 'currentKey' => $currentKey];
		}

		return $tabs;
	}

	/**
	 * validate_input aka "first stage validation"
	 * This checks for valid input source data before exec
	 * @Exception 1XX
	 */
	protected function validateInput() {

		self::setValidSortTypes();

		if(empty($this->offset)) {
			$this->offset = 0;
		}

		// Missing values
		$check_missing = ['type', 'offset', 'limit', 'sort_type', 'sort_order'];
		missing_values_to_exception($this, 'CHV\ListingException', $check_missing, 100);

		// Validate type
		if(!in_array($this->type, self::$valid_types)) {
			throw new ListingException('Invalid $type "'.$this->type.'"', 110);
		}

		// Validate limits
		if($this->offset == 0 && $this->limit == 0) {
			throw new ListingException('$offset and $limit are equal to 0 (zero)', 120);
		}
		if($this->offset < 0 || $this->limit < 0) {
			throw new ListingException('Limit integrity violation', 121);
		}

		// Validate sort type
		if(!in_array($this->sort_type, self::$valid_sort_types)) {
			throw new ListingException('Invalid $sort_type "'.$this->sort_type.'"', 130);
		}

		// Validate sort order
		if(!preg_match('/^(asc|desc)$/', $this->sort_order)) {
			throw new ListingException('Invalid $sort_order "'.$this->sort_order.'"', 140);
		}

	}

	// Handler for all those switcheable sort options (based on on/off settings)
	protected static function setValidSortTypes() {
	}
	
	public function htmlOutput($tpl_list=NULL) {

		if(!is_array($this->output)) {
			return;
		}

		if(is_null($tpl_list)) {
			$tpl_list = $this->type ?: 'images';
		}

		$directory = new \RecursiveDirectoryIterator(G_APP_PATH_THEME . 'tpl_list_item/');
		$iterator = new \RecursiveIteratorIterator($directory);
		$regex  = new \RegexIterator($iterator, '/^.+\.php$/i', \RecursiveRegexIterator::GET_MATCH);

		$list_item_template = [];

		foreach($regex as $file) {
			$file = G\forward_slash($file[0]);
			$key = preg_replace('/\\.[^.\\s]{3,4}$/', '', str_replace(G_APP_PATH_THEME, NULL, $file));
			$override_file = G\str_replace_first(G_APP_PATH_THEME, G_APP_PATH_THEME . 'overrides/', $file);
			if(is_readable($override_file)) {
				$file = $override_file;
			}
			ob_start();
			require($file);
			$file_get_contents = ob_get_contents();
			ob_end_clean();
			$list_item_template[$key] = $file_get_contents;
		}

		$html_output = '';
		$tpl_list = preg_replace('/s$/', '', $tpl_list);

		foreach($this->output as $row) {
			switch($tpl_list) {
				case 'image':
				case 'user/image':
				case 'album/image':
				default: // key thing here...
					$Class = 'CHV\Image';
				break;
				case 'album':
				case 'user/album':
					$Class = 'CHV\Album';
				break;
				case 'user':
				case 'user/user':
					$Class = 'CHV\User';
				break;
			}

			$item = $Class::formatArray($row);

			$tools = $this->tools ?: NULL;

			if(function_exists('get_peafowl_item_list')) {
				$render = 'get_peafowl_item_list';
			} else {
				$render = 'CHV\Render\get_peafowl_item_list';
			}

			$html_output .= $render($tpl_list, $item, $list_item_template, Login::getUser()['id'], $tools);

		}

		return $html_output;
	}

	public static function getAlbumHtml($album_id, $template='user/albums') {
		try {
			$album = new Listing;
			$album->setType('albums');
			$album->setOffset(0);
			$album->setLimit(1);
			$album->setSortType('date');
			$album->setSortOrder('desc');
			$album->setWhere('WHERE album_id=:album_id');
			$album->bind(':album_id', $album_id);
			$album->exec();
			return $album->htmlOutput($template);
		} catch(Exception $e) {
			throw new ListingException($e->getMessage(), 400);
		}
	}

	public static function getParams($json_call=false) {

		self::setValidSortTypes();

		$items_per_page = getSetting('listing_items_per_page');
		$listing_pagination_mode = getSetting('listing_pagination_mode');

		$params = [];
		$params['items_per_page'] = $items_per_page;

		if(!$json_call and $listing_pagination_mode == 'endless') {
			$params['page'] = max(intval($_REQUEST['page']), 1);
			$params['limit'] = $params['items_per_page'] * $params['page'];
			$params['offset'] = 0;

			// Switch endless to classic if we are dealing with large listings (from GET)
			if($params['limit'] > getSetting('listing_safe_count')) {
				$listing_pagination_mode = 'classic';
				Settings::setValue('listing_pagination_mode', $listing_pagination_mode );
			}
		}

		if(isset($_REQUEST['pagination']) or $listing_pagination_mode == 'classic') { // Static single page display
			$params['page'] = $_REQUEST['page'] ? intval($_REQUEST['page']) - 1 : 0;
			$params['limit'] = $params['items_per_page'];
			$params['offset'] = $params['page']*$params['limit'];
		}

		if($json_call) {
			$params = array_merge($params, [
				'page'	=> $_REQUEST['page'] ? $_REQUEST['page'] - 1 : 0,
				'limit'	=> $items_per_page
			]);
			$params['offset'] = $params['page'] * $params['limit'] + ($_REQUEST['offset'] ? $_REQUEST['offset'] : 0);
		}

		$default_sort = [
			0 => 'date',
			1 => 'desc'
		];

		preg_match('/(.*)_(asc|desc)/', $_REQUEST['sort'], $sort_matches);
		$params['sort'] = array_slice($sort_matches, 1);

		// Empty sort
		if(count($params['sort']) !== 2) {
			$params['sort'] = $default_sort;
		}

		// Check sort type
		if(!in_array($params['sort'][0], self::$valid_sort_types)) {
			$params['sort'][0] = $default_sort[0];
		}
		// Check sort order
		if(!in_array($params['sort'][1], ['asc', 'desc'])) {
			$params['sort'][1] = $default_sort[1];
		}

		return $params;

	}

}

class ListingException extends Exception {}
